(19)

(11)

EP 0 765 189 A1

(12)

(43) Date of publication: 02.04.1997 Bulletin 1997/14 (21) Application number: 95910256.0 (22) Date of filing: 14.02.1995

(51) International Patent Classification (IPC):  B01D 53/ 86( . ) B01J 23/ 58( . ) B01J 37/ 02( . ) B01D 53/ 94( . ) B01J 23/ 63( . ) (86) International application number: PCT/US1995/001849 (87) International publication number: WO 1995/035152 (28.12.1995 Gazette 1996/03)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 17.06.1994 US 19940261624 (71) Applicant: ENGELHARD CORPORATION Iselin, New Jersey 08830-0770 (US)	(72) Inventors: CHEN, Shau-Lin Piscataway, NJ 08854 (US) RABINOWITZ, Harold, N. Upper Montclair, NJ 07043 (US) TAUSTER, Samuel, J. Englishtown, NJ 07726 (US) (74) Representative: Fisher, Adrian John  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)